Maya Culbreath, 24, of Rialto is one of the victims killed in a freeway crash in Diamond Bar on Feb. She is the sister of the driver suspected in the crash. Five others were killed in the wreck.

POMONA >> Attorneys have delayed the arraignment again for a Fontana woman charged in a drunken-driving crash that killed six people.

Olivia Carolee Culbreath, 21, is scheduled to return to court July 18, said Los Angeles County district attorney’s spokeswoman Sarah Ardalani.

Previous arraignment hearings had been delayed either for medical reasons or because attorneys needed to review the case, which includes more than 800 pages of discovery.

It was unclear why Wednesday’s hearing was postponed.

Culbreath has been charged with six counts of murder in the deaths of Gregorio Mejia-Martinez, 47; Leticia Ibarra, 42; Jessica Jasmine Mejia, 20; and Ester Delgado, all of Huntington Park; Kristin Melissa Young, 21, of Chino; and her sister, Maya Louise Culbreath, 24, of Rialto.

California Highway Patrol officers said Culbreath was driving her red Chevrolet Camaro the wrong way on the westbound 60 Freeway on Feb. 9 in Diamond Bar when she slammed into a Ford Explorer. All occupants of the Explorer died, as did Culbreath’s two passengers.

Culbreath has been in custody since the crash, first in the hospital and then in the Twin Towers Correctional Facility in Los Angeles.